linux-kernel - Re: [PATCH 07/12] perf hists browser: Allow passing an initial hotkey

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Date:   Wed, 18 Dec 2019 15:23:21 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Clark Williams <williams@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Kan Liang <kan.liang@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 07/12] perf hists browser: Allow passing an initial hotkey

On Wed, Dec 18, 2019 at 11:08:31AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Wed, Dec 18, 2019 at 09:08:18AM +0100, Jiri Olsa escreveu:
> > On Tue, Dec 17, 2019 at 11:48:23AM -0300, Arnaldo Carvalho de Melo wrote:
> > 
> > SNIP
> > 
> > > diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
> > > index 6dfdd8d5a743..3b7af5a8d101 100644
> > > --- a/tools/perf/ui/browsers/hists.c
> > > +++ b/tools/perf/ui/browsers/hists.c
> > > @@ -673,9 +673,8 @@ static int hist_browser__title(struct hist_browser *browser, char *bf, size_t si
> > >  }
> > >  
> > >  int hist_browser__run(struct hist_browser *browser, const char *help,
> > > -		      bool warn_lost_event)
> > > +		      bool warn_lost_event, int key)
> > >  {
> > > -	int key;
> > >  	char title[160];
> > >  	struct hist_browser_timer *hbt = browser->hbt;
> > >  	int delay_secs = hbt ? hbt->refresh : 0;
> > > @@ -688,9 +687,12 @@ int hist_browser__run(struct hist_browser *browser, const char *help,
> > >  	if (ui_browser__show(&browser->b, title, "%s", help) < 0)
> > >  		return -1;
> > >  
> > > +	if (key)
> > > +		goto do_hotkey;
> > > +
> > >  	while (1) {
> > >  		key = ui_browser__run(&browser->b, delay_secs);
> > > -
> > > +do_hotkey:
> > 
> > or we could switch the 'swtich' and ui_browser__run, and get rid of the goto, like:
> > 
> > 	while (1) {
> >   		switch (key) {
> > 		...
> > 		}
> > 
> > 		key = ui_browser__run(&browser->b, delay_secs);
> > 	}
> 
> I think those are equivalent and having the test like I did is more
> clear, i.e. "has this key been provided" instead of going to the switch
> just to hit the default case for the zero in key and call
> ui_browser__run().

sure, I just don't like goto other than for error handling,
looks too hacky to me ;-) but of course it's your call

jirka